/* $NetBSD: route.c,v 1.19 1998/07/05 06:49:17 jonathan Exp $ */ /*- * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Kevin M. Lahey of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1980, 1986, 1991, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)route.c 8.3 (Berkeley) 1/9/95 */ #include "opt_ns.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef NS #include #endif #define SA(p) ((struct sockaddr *)(p)) int rttrash; /* routes not in table but not freed */ struct sockaddr wildcard; /* zero valued cookie for wildcard searches */ void rtable_init(table) void **table; { struct domain *dom; for (dom = domains; dom; dom = dom->dom_next) if (dom->dom_rtattach) dom->dom_rtattach(&table[dom->dom_family], dom->dom_rtoffset); } void route_init() { rn_init(); /* initialize all zeroes, all ones, mask table */ rtable_init((void **)rt_tables); } /* * Packet routing routines. */ void rtalloc(ro) register struct route *ro; { if (ro->ro_rt && ro->ro_rt->rt_ifp && (ro->ro_rt->rt_flags & RTF_UP)) return; /* XXX */ ro->ro_rt = rtalloc1(&ro->ro_dst, 1); } struct rtentry * rtalloc1(dst, report) register struct sockaddr *dst; int report; { register struct radix_node_head *rnh = rt_tables[dst->sa_family]; register struct rtentry *rt; register struct radix_node *rn; struct rtentry *newrt = 0; struct rt_addrinfo info; int s = splsoftnet(), err = 0, msgtype = RTM_MISS; if (rnh && (rn = rnh->rnh_matchaddr((caddr_t)dst, rnh)) && ((rn->rn_flags & RNF_ROOT) == 0)) { newrt = rt = (struct rtentry *)rn; if (report && (rt->rt_flags & RTF_CLONING)) { err = rtrequest(RTM_RESOLVE, dst, SA(0), SA(0), 0, &newrt); if (err) { newrt = rt; rt->rt_refcnt++; goto miss; } if ((rt = newrt) && (rt->rt_flags & RTF_XRESOLVE)) { msgtype = RTM_RESOLVE; goto miss; } } else rt->rt_refcnt++; } else { rtstat.rts_unreach++; miss: if (report) { bzero((caddr_t)&info, sizeof(info)); info.rti_info[RTAX_DST] = dst; rt_missmsg(msgtype, &info, 0, err); } } splx(s); return (newrt); } void rtfree(rt) register struct rtentry *rt; { register struct ifaddr *ifa; if (rt == 0) panic("rtfree"); rt->rt_refcnt--; if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_UP) == 0) { if (rt->rt_nodes->rn_flags & (RNF_ACTIVE | RNF_ROOT)) panic ("rtfree 2"); rttrash--; if (rt->rt_refcnt < 0) { printf("rtfree: %p not freed (neg refs)\n", rt); return; } rt_timer_remove_all(rt); ifa = rt->rt_ifa; IFAFREE(ifa); Free(rt_key(rt)); Free(rt); } } void ifafree(ifa) register struct ifaddr *ifa; { if (ifa == NULL) panic("ifafree"); if (ifa->ifa_refcnt == 0) free(ifa, M_IFADDR); else ifa->ifa_refcnt--; } /* * Force a routing table entry to the specified * destination to go through the given gateway. * Normally called as a result of a routing redirect * message from the network layer. * * N.B.: must be called at splsoftnet * */ void rtredirect(dst, gateway, netmask, flags, src, rtp) struct sockaddr *dst, *gateway, *netmask, *src; int flags; struct rtentry **rtp; { register struct rtentry *rt; int error = 0; short *stat = 0; struct rt_addrinfo info; struct ifaddr *ifa; /* verify the gateway is directly reachable */ if ((ifa = ifa_ifwithnet(gateway)) == 0) { error = ENETUNREACH; goto out; } rt = rtalloc1(dst, 0); /* * If the redirect isn't from our current router for this dst, * it's either old or wrong. If it redirects us to ourselves, * we have a routing loop, perhaps as a result of an interface * going down recently. */ #define equal(a1, a2) (bcmp((caddr_t)(a1), (caddr_t)(a2), (a1)->sa_len) == 0) if (!(flags & RTF_DONE) && rt && (!equal(src, rt->rt_gateway) || rt->rt_ifa != ifa)) error = EINVAL; else if (ifa_ifwithaddr(gateway)) error = EHOSTUNREACH; if (error) goto done; /* * Create a new entry if we just got back a wildcard entry * or the the lookup failed. This is necessary for hosts * which use routing redirects generated by smart gateways * to dynamically build the routing tables. */ if ((rt == 0) || (rt_mask(rt) && rt_mask(rt)->sa_len < 2)) goto create; /* * Don't listen to the redirect if it's * for a route to an interface. */ if (rt->rt_flags & RTF_GATEWAY) { if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) { /* * Changing from route to net => route to host. * Create new route, rather than smashing route to net. */ create: flags |= RTF_GATEWAY | RTF_DYNAMIC; error = rtrequest((int)RTM_ADD, dst, gateway, netmask, flags, (struct rtentry **)0); stat = &rtstat.rts_dynamic; } else { /* * Smash the current notion of the gateway to * this destination. Should check about netmask!!! */ rt->rt_flags |= RTF_MODIFIED; flags |= RTF_MODIFIED; stat = &rtstat.rts_newgateway; rt_setgate(rt, rt_key(rt), gateway); } } else error = EHOSTUNREACH; done: if (rt) { if (rtp && !error) *rtp = rt; else rtfree(rt); } out: if (error) rtstat.rts_badredirect++; else if (stat != NULL) (*stat)++; bzero((caddr_t)&info, sizeof(info)); info.rti_info[RTAX_DST] = dst; info.rti_info[RTAX_GATEWAY] = gateway; info.rti_info[RTAX_NETMASK] = netmask; info.rti_info[RTAX_AUTHOR] = src; rt_missmsg(RTM_REDIRECT, &info, flags, error); } /* * Routing table ioctl interface. */ int rtioctl(req, data, p) u_long req; caddr_t data; struct proc *p; { return (EOPNOTSUPP); } struct ifaddr * ifa_ifwithroute(flags, dst, gateway) int flags; struct sockaddr *dst, *gateway; { register struct ifaddr *ifa; if ((flags & RTF_GATEWAY) == 0) { /* * If we are adding a route to an interface, * and the interface is a pt to pt link * we should search for the destination * as our clue to the interface. Otherwise * we can use the local address. */ ifa = 0; if (flags & RTF_HOST) ifa = ifa_ifwithdstaddr(dst); if (ifa == 0) ifa = ifa_ifwithaddr(gateway); } else { /* * If we are adding a route to a remote net * or host, the gateway may still be on the * other end of a pt to pt link. */ ifa = ifa_ifwithdstaddr(gateway); } if (ifa == 0) ifa = ifa_ifwithnet(gateway); if (ifa == 0) { struct rtentry *rt = rtalloc1(dst, 0); if (rt == 0) return (0); rt->rt_refcnt--; if ((ifa = rt->rt_ifa) == 0) return (0); } if (ifa->ifa_addr->sa_family != dst->sa_family) { struct ifaddr *oifa = ifa; ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp); if (ifa == 0) ifa = oifa; } return (ifa); } #define ROUNDUP(a) (a>0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) int rtrequest(req, dst, gateway, netmask, flags, ret_nrt) int req, flags; struct sockaddr *dst, *gateway, *netmask; struct rtentry **ret_nrt; { int s = splsoftnet(); int error = 0; register struct rtentry *rt; register struct radix_node *rn; register struct radix_node_head *rnh; struct ifaddr *ifa; struct sockaddr *ndst; #define senderr(x) { error = x ; goto bad; } if ((rnh = rt_tables[dst->sa_family]) == 0) senderr(ESRCH); if (flags & RTF_HOST) netmask = 0; switch (req) { case RTM_DELETE: if ((rn = rnh->rnh_deladdr(dst, netmask, rnh)) == 0) senderr(ESRCH); if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT)) panic ("rtrequest delete"); rt = (struct rtentry *)rn; rt->rt_flags &= ~RTF_UP; if (rt->rt_gwroute) { rt = rt->rt_gwroute; RTFREE(rt); (rt = (struct rtentry *)rn)->rt_gwroute = 0; } if ((ifa = rt->rt_ifa) && ifa->ifa_rtrequest) ifa->ifa_rtrequest(RTM_DELETE, rt, SA(0)); rttrash++; if (ret_nrt) *ret_nrt = rt; else if (rt->rt_refcnt <= 0) { rt->rt_refcnt++; rtfree(rt); } break; case RTM_RESOLVE: if (ret_nrt == 0 || (rt = *ret_nrt) == 0) senderr(EINVAL); ifa = rt->rt_ifa; flags = rt->rt_flags & ~RTF_CLONING; gateway = rt->rt_gateway; if ((netmask = rt->rt_genmask) == 0) flags |= RTF_HOST; goto makeroute; case RTM_ADD: if ((ifa = ifa_ifwithroute(flags, dst, gateway)) == 0) senderr(ENETUNREACH); makeroute: R_Malloc(rt, struct rtentry *, sizeof(*rt)); if (rt == 0) senderr(ENOBUFS); Bzero(rt, sizeof(*rt)); rt->rt_flags = RTF_UP | flags; LIST_INIT(&rt->rt_timer); if (rt_setgate(rt, dst, gateway)) { Free(rt); senderr(ENOBUFS); } ndst = rt_key(rt); if (netmask) { rt_maskedcopy(dst, ndst, netmask); } else Bcopy(dst, ndst, dst->sa_len); rn = rnh->rnh_addaddr((caddr_t)ndst, (caddr_t)netmask, rnh, rt->rt_nodes); if (rn == 0) { if (rt->rt_gwroute) rtfree(rt->rt_gwroute); Free(rt_key(rt)); Free(rt); senderr(EEXIST); } ifa->ifa_refcnt++; rt->rt_ifa = ifa; rt->rt_ifp = ifa->ifa_ifp; if (req == RTM_RESOLVE) rt->rt_rmx = (*ret_nrt)->rt_rmx; /* copy metrics */ if (ifa->ifa_rtrequest) ifa->ifa_rtrequest(req, rt, SA(ret_nrt ? *ret_nrt : 0)); if (ret_nrt) { *ret_nrt = rt; rt->rt_refcnt++; } break; } bad: splx(s); return (error); } int rt_setgate(rt0, dst, gate) struct rtentry *rt0; struct sockaddr *dst, *gate; { caddr_t new, old; int dlen = ROUNDUP(dst->sa_len), glen = ROUNDUP(gate->sa_len); register struct rtentry *rt = rt0; if (rt->rt_gateway == 0 || glen > ROUNDUP(rt->rt_gateway->sa_len)) { old = (caddr_t)rt_key(rt); R_Malloc(new, caddr_t, dlen + glen); if (new == 0) return 1; rt->rt_nodes->rn_key = new; } else { new = rt->rt_nodes->rn_key; old = 0; } Bcopy(gate, (rt->rt_gateway = (struct sockaddr *)(new + dlen)), glen); if (old) { Bcopy(dst, new, dlen); Free(old); } if (rt->rt_gwroute) { rt = rt->rt_gwroute; RTFREE(rt); rt = rt0; rt->rt_gwroute = 0; } if (rt->rt_flags & RTF_GATEWAY) { rt->rt_gwroute = rtalloc1(gate, 1); } return 0; } void rt_maskedcopy(src, dst, netmask) struct sockaddr *src, *dst, *netmask; { register u_char *cp1 = (u_char *)src; register u_char *cp2 = (u_char *)dst; register u_char *cp3 = (u_char *)netmask; u_char *cplim = cp2 + *cp3; u_char *cplim2 = cp2 + *cp1; *cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */ cp3 += 2; if (cplim > cplim2) cplim = cplim2; while (cp2 < cplim) *cp2++ = *cp1++ & *cp3++; if (cp2 < cplim2) bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2)); } /* * Set up a routing table entry, normally * for an interface. */ int rtinit(ifa, cmd, flags) register struct ifaddr *ifa; int cmd, flags; { register struct rtentry *rt; register struct sockaddr *dst; register struct sockaddr *deldst; struct mbuf *m = 0; struct rtentry *nrt = 0; int error; dst = flags & RTF_HOST ? ifa->ifa_dstaddr : ifa->ifa_addr; if (cmd == RTM_DELETE) { if ((flags & RTF_HOST) == 0 && ifa->ifa_netmask) { m = m_get(M_WAIT, MT_SONAME); deldst = mtod(m, struct sockaddr *); rt_maskedcopy(dst, deldst, ifa->ifa_netmask); dst = deldst; } if ((rt = rtalloc1(dst, 0)) != NULL) { rt->rt_refcnt--; if (rt->rt_ifa != ifa) { if (m) (void) m_free(m); return (flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); } } } error = rtrequest(cmd, dst, ifa->ifa_addr, ifa->ifa_netmask, flags | ifa->ifa_flags, &nrt); if (m) (void) m_free(m); if (cmd == RTM_DELETE && error == 0 && (rt = nrt)) { rt_newaddrmsg(cmd, ifa, error, nrt); if (rt->rt_refcnt <= 0) { rt->rt_refcnt++; rtfree(rt); } } if (cmd == RTM_ADD && error == 0 && (rt = nrt)) { rt->rt_refcnt--; if (rt->rt_ifa != ifa) { printf("rtinit: wrong ifa (%p) was (%p)\n", ifa, rt->rt_ifa); if (rt->rt_ifa->ifa_rtrequest) rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt, SA(0)); IFAFREE(rt->rt_ifa); rt->rt_ifa = ifa; rt->rt_ifp = ifa->ifa_ifp; ifa->ifa_refcnt++; if (ifa->ifa_rtrequest) ifa->ifa_rtrequest(RTM_ADD, rt, SA(0)); } rt_newaddrmsg(cmd, ifa, error, nrt); } return (error); } /* * Route timer routines. These routes allow functions to be called * for various routes at any time. This is useful in supporting * path MTU discovery and redirect route deletion. * * This is similar to some BSDI internal functions, but it provides * for multiple queues for efficiency's sake... */ LIST_HEAD(, rttimer_queue) rttimer_queue_head; static int rt_init_done = 0; #define RTTIMER_CALLOUT(r) { \ if (r->rtt_func != NULL) { \ r->rtt_func(r->rtt_rt, r); \ } else { \ rtrequest((int) RTM_DELETE, \ (struct sockaddr *)rt_key(r->rtt_rt), \ 0, 0, 0, 0); \ } \ } /* * Some subtle order problems with domain initialization mean that * we cannot count on this being run from rt_init before various * protocol initializations are done. Therefore, we make sure * that this is run when the first queue is added... */ void rt_timer_init() { assert(rt_init_done == 0); LIST_INIT(&rttimer_queue_head); timeout(rt_timer_timer, NULL, hz); /* every second */ rt_init_done = 1; } struct rttimer_queue * rt_timer_queue_create(timeout) u_int timeout; { struct rttimer_queue *rtq; if (rt_init_done == 0) rt_timer_init(); R_Malloc(rtq, struct rttimer_queue *, sizeof *rtq); if (rtq == NULL) return NULL; rtq->rtq_timeout = timeout; CIRCLEQ_INIT(&rtq->rtq_head); LIST_INSERT_HEAD(&rttimer_queue_head, rtq, rtq_link); return rtq; } void rt_timer_queue_change(rtq, timeout) struct rttimer_queue *rtq; long timeout; { rtq->rtq_timeout = timeout; } void rt_timer_queue_destroy(rtq, destroy) struct rttimer_queue *rtq; int destroy; { struct rttimer *r, *r0; r = CIRCLEQ_FIRST(&rtq->rtq_head); while (r != (struct rttimer *) &rtq->rtq_head) { r0 = CIRCLEQ_NEXT(r, rtt_next); CIRCLEQ_REMOVE(&rtq->rtq_head, r, rtt_next); LIST_REMOVE(r, rtt_link); if (destroy != 0) RTTIMER_CALLOUT(r); Free(r); r = r0; } LIST_REMOVE(rtq, rtq_link); } void rt_timer_remove_all(rt) struct rtentry *rt; { struct rttimer *r, *r0; r = LIST_FIRST(&rt->rt_timer); while (r) { r0 = LIST_NEXT(r, rtt_link); LIST_REMOVE(r, rtt_link); CIRCLEQ_REMOVE(&r->rtt_queue->rtq_head, r, rtt_next); Free(r); r = r0; } } int rt_timer_add(rt, func, queue) struct rtentry *rt; void(*func) __P((struct rtentry *, struct rttimer *)); struct rttimer_queue *queue; { struct rttimer *r, *rttimer; int s; long current_time; s = splclock(); current_time = mono_time.tv_sec; splx(s); for (r = LIST_FIRST(&rt->rt_timer); r; r = LIST_NEXT(r, rtt_link)) { if (r->rtt_func == func) { LIST_REMOVE(r, rtt_link); CIRCLEQ_REMOVE(&r->rtt_queue->rtq_head, r, rtt_next); Free(r); break; /* only one per list, so we can quit... */ } } R_Malloc(rttimer, struct rttimer *, sizeof *rttimer); if (rttimer == NULL) return ENOBUFS; rttimer->rtt_rt = rt; rttimer->rtt_time = current_time; rttimer->rtt_func = func; rttimer->rtt_queue = queue; LIST_INSERT_HEAD(&rt->rt_timer, rttimer, rtt_link); r = CIRCLEQ_LAST(&queue->rtq_head); while (r && r != (struct rttimer *) &queue->rtq_head && r->rtt_time > current_time) r = CIRCLEQ_PREV(r, rtt_next); if (r) CIRCLEQ_INSERT_AFTER(&queue->rtq_head, r, rttimer, rtt_next); else CIRCLEQ_INSERT_HEAD(&queue->rtq_head, rttimer, rtt_next); return 0; } /* ARGSUSED */ void rt_timer_timer(arg) void *arg; { struct rttimer *r, *rttimer; struct rttimer_queue *rtq; long current_time; int s; s = splclock(); current_time = mono_time.tv_sec; splx(s); for (rtq = LIST_FIRST(&rttimer_queue_head); rtq != NULL; rtq = LIST_NEXT(rtq, rtq_link)) { rttimer = CIRCLEQ_FIRST(&rtq->rtq_head); while (rttimer != (struct rttimer *) &rtq->rtq_head && (rttimer->rtt_time + rtq->rtq_timeout) < current_time) { r = CIRCLEQ_NEXT(rttimer, rtt_next); CIRCLEQ_REMOVE(&rtq->rtq_head, rttimer, rtt_next); LIST_REMOVE(rttimer, rtt_link); RTTIMER_CALLOUT(rttimer); Free(rttimer); rttimer = r; } } timeout(rt_timer_timer, NULL, hz); /* every second */ }